HTTP headers

This tool will help you see that a URL returns correct headers for example when validating post URLs, 301s, or content security policies.

Click here to test it with an example! Can you spot a custom header? I added it to the site a long time ago. Hopefully it's still there.

Enter a URL

Headers send from https://hifk.fi

HTTP/1.1 200 OK
Connection: close
Content-Type: text/html; charset=UTF-8
Link: ; rel="https://api.w.org/"
Link: ; rel="alternate"; title="JSON"; type="application/json"
Link: ; rel=shortlink
X-LiteSpeed-Cache-Control: no-cache,esi=on
Cache-Control: no-cache, must-revalidate, max-age=0, no-store, private
Transfer-Encoding: chunked
Date: Thu, 04 Dec 2025 03:28:54 GMT
Server: LiteSpeed
Strict-Transport-Security: max-age=31536000


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